instance method validates_each

Validates each attribute against a block.

class Person
  include ActiveModel::Validations

  attr_accessor :first_name, :last_name

  validates_each :first_name, :last_name, allow_blank: true do |record, attr, value|
    record.errors.add attr, "starts with z." if value.start_with?("z")
  end
end

Options

• :on - Specifies the contexts where this validation is active. Runs in all validation contexts by default nil. You can pass a symbol or an array of symbols. (e.g. on: :create or on: :custom_validation_context or on: [:create, :custom_validation_context])

• :except_on - Specifies the contexts where this validation is not active. Runs in all validation contexts by default nil. You can pass a symbol or an array of symbols. (e.g. except_on: :create or except_on: :custom_validation_context or except_on: [:create, :custom_validation_context])

• :allow_nil - Specify a method, proc, or boolean, to skip validation if attribute is nil (e.g. allow_nil: true, or allow_nil: Proc.new { |user| user.signup_step > 2 }).

• :allow_blank - Specify a method, proc, or boolean, to skip validation if attribute is blank (e.g. allow_blank: true, or allow_blank: Proc.new { |user| user.signup_step > 2 }).

• :if - Specifies a method, proc, or string to call to determine if the validation should occur (e.g. if: :allow_validation, or if: Proc.new { |user| user.signup_step > 2 }). The method, proc or string should return or evaluate to a true or false value. Multiple methods or procs can be passed as an array to check multiple conditions, all of which must pass for validation to occur (e.g. if: [:allow_validation, Proc.new { |user| user.signup_step > 2 }])

• :unless - Specifies a method, proc, or string to call to determine if the validation should not occur (e.g. unless: :skip_validation, or unless: Proc.new { |user| user.signup_step <= 2 }). The method, proc, or string should return or evaluate to a true or false value. Multiple methods or procs can be passed as an array to check multiple conditions, all of which must pass for validation not to occur (e.g. unless: [:skip_validation, Proc.new { |user| user.signup_step <= 2 }])